Common Weakness Enumeration
CWE-444
AllowedInconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Abstraction: Base · Status: Incomplete
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
695 vulnerabilities reference this CWE, most recent first.
CVE-2026-103399 (GCVE-0-2026-103399)
Vulnerability from cvelistv5 – Published: 2026-09-30 17:42 – Updated: 2026-09-30 19:11
VLAI
EPSS
VEX
Title
Libsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body
Summary
A flaw was found in SoupServer (libsoup). When an HTTP/1.x client sends a request with Expect: 100-continue and a request body, and SoupServer returns an early final (non-1xx) response before the body is read, the server neither drains the declared body bytes nor closes the connection. On a keep-alive connection, those leftover bytes are interpreted as a subsequent HTTP request. A remote, unauthenticated attacker can place a complete HTTP request in the body and cause SoupServer to process that smuggled request, leading to unintended request handling.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:10 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-103399 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2543949 | issue-trackingx_refsource_REDHAT |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
Date Public
2026-09-29 00:00
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CVE-2026-100724 (GCVE-0-2026-100724)
Vulnerability from cvelistv5 – Published: 2026-09-27 01:28 – Updated: 2026-09-30 15:15
VLAI
EPSS
VEX
Title
http4k before 6.49.0.0 Host Header Routing Bypass via reverseProxy
Summary
http4k (Maven package org.http4k:http4k-core) before 6.49.0.0, 5.42.0.0 and 4.51.0.0 uses substring (Contains) matching on the Host header by default in reverseProxy() and reverseProxyRouting() when dispatching to configured virtual hosts. If these functions are deployed as a public-facing inbound HTTP handler with two or more configured virtual hosts, a remote attacker can supply a Host header that merely contains a configured vhost name (for example Host: admin.evil.com for a vhost configured as "admin") and be routed to that vhost, bypassing routing-based authorization. The intended outbound-dispatch and test-time uses, where the Host value is set by the calling application, are not affected.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 15:15 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/http4k/http4k/security/advisor… | vendor-advisory |
| https://github.com/http4k/http4k/commit/0121b05537 | patch |
| https://github.com/http4k/http4k/commit/54c6385615 | patch |
| https://www.vulncheck.com/advisories/http4k-befor… | third-party-advisory |
Impacted products
Date Public
2026-06-16 00:00
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CVE-2026-100666 (GCVE-0-2026-100666)
Vulnerability from cvelistv5 – Published: 2026-09-26 13:23 – Updated: 2026-09-30 14:54
VLAI
EPSS
VEX
Title
Netty 4.2.0 through 4.2.16 Response Desynchronization via HttpServerCodec
Summary
Netty's HttpServerCodec (io.netty:netty-codec-http) in versions 4.2.0.Final through 4.2.16.Final and in versions up to and including 4.1.136.Final pairs each outbound response with an inbound request by calling pollMethod() once per response, including for 1xx informational responses. If a client pipelines an HTTP/1.1 GET carrying an Expect: 100-continue header followed by a HEAD request, the 100 Continue response consumes the queued GET method, so the subsequent 200 OK for the GET is paired with HEAD and its body is dropped, while the following 200 OK for the HEAD request is written with a body. This desynchronizes HTTP parsing on the connection: the GET entity is never delivered and the HEAD response body is interpreted as the GET body, resulting in response splitting and unsafe connection reuse. Fixed in 4.2.17.Final and 4.1.137.Final.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 14:54 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/netty-4.2.0-… | third-party-advisory |
Impacted products
Date Public
2026-09-10 00:00
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CVE-2026-100659 (GCVE-0-2026-100659)
Vulnerability from cvelistv5 – Published: 2026-09-26 13:23 – Updated: 2026-09-28 18:17
VLAI
EPSS
VEX
Title
Netty 4.2.0 through 4.2.17 HTTP/3 Request Routing Bypass
Summary
Netty's HTTP/3 codec (io.netty:netty-codec-http3) in versions 4.2.0.Final through 4.2.17.Final does not enforce the RFC 9114 requirement that the :authority pseudo-header field and a literal host header field, when both present, carry the same value. A remote unauthenticated peer can send a single HEADERS frame containing both fields with differing, attacker-controlled values; the request is accepted and delivered to the application with two conflicting authorities, allowing routing, virtual-host, and access-control decisions to be bypassed when different components in the request path consult different fields. This issue is fixed in 4.2.18.Final.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 18:16 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/netty-4.2.0-… | third-party-advisory |
Impacted products
Date Public
2026-09-10 00:00
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CVE-2026-94194 (GCVE-0-2026-94194)
Vulnerability from cvelistv5 – Published: 2026-09-28 11:15 – Updated: 2026-09-30 13:17
VLAI
EPSS
VEX
Title
Mint HTTP/1 client applies chunked framing when chunked is not the final transfer coding, enabling response smuggling through intermediaries
Summary
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint mint allows a malicious HTTP/1 server to desynchronize an intermediary and the Mint client on a pooled connection, poisoning the responses to subsequent requests that share the connection.
message_body/1 in lib/mint/http1.ex selects chunked framing when chunked is the first coding listed in a response's Transfer-Encoding fields. RFC 9112 section 6.3 applies chunked framing only when chunked is the final coding, and otherwise reads the body until the server closes the connection. For a response such as Transfer-Encoding: chunked, gzip, an intermediary that follows the RFC treats every byte up to the close as the body, while Mint ends the body at the zero-length chunk and parses the remaining bytes as the response to the next request on the connection.
Mint also keeps the connection open after an HTTP/1.0 response, final or 1xx, that carries Transfer-Encoding and Connection: keep-alive. RFC 9112 section 6.1 requires treating the framing of such a message as faulty and closing the connection after it, so bytes after its chunked body are parsed as the response to the next request in the same way.
This issue affects mint: from 0.1.0 before 1.10.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 13:16 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-mint | mint |
Affected:
0.1.0 , < 1.10.2
(semver)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
|
| elixir-mint | mint |
Affected:
60089586ec7adc9fddb09f69a2f5919ba9ac7f33 , < *
(git)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
Date Public
2026-09-28 11:15
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"value": "* Start a loopback TCP server that answers the first request with HTTP/1.1 200 OK and Transfer-Encoding: chunked, gzip, the chunked body 5\\r\\nLEGIT\\r\\n0\\r\\n\\r\\n, and directly after it the bytes HTTP/1.1 200 OK\\r\\nContent-Length: 8\\r\\n\\r\\nSMUGGLED.\n* Connect with Mint.HTTP1 and send a request. Mint returns LEGIT as the complete body, keeps the connection open, and holds the second response in conn.buffer.\n* Send a second request on the same connection and have the server answer it with a real response. Mint returns SMUGGLED as the response to the second request and keeps the real one in the buffer.\n* Pipelining both requests before the server answers gives the same result from a single Mint.HTTP1.stream/2 call."
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"value": "\u003cp\u003e\u003cstrong\u003e1. Coding list.\u003c/strong\u003e \u003ccode\u003estore_header/3\u003c/code\u003e in \u003ccode\u003elib/mint/http1.ex\u003c/code\u003e tokenizes each \u003ccode\u003eTransfer-Encoding\u003c/code\u003e field with \u003ccode\u003eMint.HTTP1.Parse.transfer_encoding_header/1\u003c/code\u003e and appends the codings to \u003ccode\u003erequest.transfer_encoding\u003c/code\u003e in the order received.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Framing decision.\u003c/strong\u003e \u003ccode\u003emessage_body/1\u003c/code\u003e returns chunked framing when \u003ccode\u003eList.first(request.transfer_encoding)\u003c/code\u003e is \u003ccode\u003e\"chunked\"\u003c/code\u003e. The only other \u003ccode\u003eTransfer-Encoding\u003c/code\u003e check rejects a response that also carries \u003ccode\u003eContent-Length\u003c/code\u003e, so \u003ccode\u003echunked, gzip\u003c/code\u003e on its own is framed as chunked.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Leftover bytes.\u003c/strong\u003e \u003ccode\u003edecode_body/5\u003c/code\u003e ends the body at the zero-length chunk and its trailer section, and \u003ccode\u003enext_request/3\u003c/code\u003e keeps the rest of the data in \u003ccode\u003econn.buffer\u003c/code\u003e or decodes it immediately as the next queued response. An RFC 9112 intermediary frames the same response as ending at connection close, so bytes it forwarded as body of the first response become the response to the next request on the Mint connection, and that request\u0027s real response is left in the buffer for the one after it.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003e4. HTTP/1.0 keep-alive.\u003c/strong\u003e \u003ccode\u003erequest_done/2\u003c/code\u003e keeps an HTTP/1.0 connection open when the response has \u003ccode\u003eConnection: keep-alive\u003c/code\u003e, without checking for \u003ccode\u003eTransfer-Encoding\u003c/code\u003e, and \u003ccode\u003edecode_body(:informational, ...)\u003c/code\u003e resets the framing state of a 1xx response and keeps parsing. An HTTP/1.0 response with \u003ccode\u003eTransfer-Encoding: chunked\u003c/code\u003e and \u003ccode\u003eConnection: keep-alive\u003c/code\u003e therefore leaves the connection open after its chunked body, and the following bytes are decoded as the next queued response, although RFC 9112 section 6.1 requires closing the connection after such a message.\u003c/p\u003e"
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"value": "**1. Coding list.** `store_header/3` in `lib/mint/http1.ex` tokenizes each `Transfer-Encoding` field with `Mint.HTTP1.Parse.transfer_encoding_header/1` and appends the codings to `request.transfer_encoding` in the order received.\n\n**2. Framing decision.** `message_body/1` returns chunked framing when `List.first(request.transfer_encoding)` is `\"chunked\"`. The only other `Transfer-Encoding` check rejects a response that also carries `Content-Length`, so `chunked, gzip` on its own is framed as chunked.\n\n**3. Leftover bytes.** `decode_body/5` ends the body at the zero-length chunk and its trailer section, and `next_request/3` keeps the rest of the data in `conn.buffer` or decodes it immediately as the next queued response. An RFC 9112 intermediary frames the same response as ending at connection close, so bytes it forwarded as body of the first response become the response to the next request on the Mint connection, and that request\u0027s real response is left in the buffer for the one after it.\n\n**4. HTTP/1.0 keep-alive.** `request_done/2` keeps an HTTP/1.0 connection open when the response has `Connection: keep-alive`, without checking for `Transfer-Encoding`, and `decode_body(:informational, ...)` resets the framing state of a 1xx response and keeps parsing. An HTTP/1.0 response with `Transfer-Encoding: chunked` and `Connection: keep-alive` therefore leaves the connection open after its chunked body, and the following bytes are decoded as the next queued response, although RFC 9112 section 6.1 requires closing the connection after such a message."
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CVE-2026-93574 (GCVE-0-2026-93574)
Vulnerability from cvelistv5 – Published: 2026-09-18 20:12 – Updated: 2026-09-24 10:35
VLAI
EPSS
VEX
Title
Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing
Summary
A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 18:18 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:69440 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:69470 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-93574 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536966 | issue-trackingx_refsource_REDHAT |
Impacted products
12 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat AMQ Broker 7 |
cpe:/a:redhat:amq_broker:7
|
|
| Red Hat | Red Hat AMQ Clients |
cpe:/a:redhat:amq_clients:2023
|
|
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 |
cpe:/a:redhat:camel_quarkus:3
|
|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 |
cpe:/a:redhat:camel_spring_boot:4
|
|
| Red Hat | Red Hat build of Apicurio Registry 3 |
cpe:/a:redhat:apicurio_registry:3
|
|
| Red Hat | Red Hat build of Debezium 3 |
cpe:/a:redhat:debezium:3
|
|
| Red Hat | Red Hat Build of Keycloak |
cpe:/a:redhat:build_keycloak:
|
|
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
cpe:/a:redhat:jboss_enterprise_application_platform:8
|
|
| Red Hat | Red Hat Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
Date Public
2026-09-10 00:52
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CVE-2026-93573 (GCVE-0-2026-93573)
Vulnerability from cvelistv5 – Published: 2026-09-18 14:44 – Updated: 2026-09-24 10:35
VLAI
EPSS
VEX
Title
Io.netty/netty-codec-http: netty split transfer-encoding fields bypass final-chunked validation and enable request smuggling
Summary
A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 16:19 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:69440 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:69470 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-93573 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536964 | issue-trackingx_refsource_REDHAT |
Impacted products
12 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat AMQ Broker 7 |
cpe:/a:redhat:amq_broker:7
|
|
| Red Hat | Red Hat AMQ Clients |
cpe:/a:redhat:amq_clients:2023
|
|
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 |
cpe:/a:redhat:camel_quarkus:3
|
|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 |
cpe:/a:redhat:camel_spring_boot:4
|
|
| Red Hat | Red Hat build of Apicurio Registry 3 |
cpe:/a:redhat:apicurio_registry:3
|
|
| Red Hat | Red Hat build of Debezium 3 |
cpe:/a:redhat:debezium:3
|
|
| Red Hat | Red Hat Build of Keycloak |
cpe:/a:redhat:build_keycloak:
|
|
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
cpe:/a:redhat:jboss_enterprise_application_platform:8
|
|
| Red Hat | Red Hat Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
Date Public
2026-09-10 00:52
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CVE-2026-93569 (GCVE-0-2026-93569)
Vulnerability from cvelistv5 – Published: 2026-09-18 14:27 – Updated: 2026-09-22 18:55
VLAI
EPSS
VEX
Title
Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority
Summary
A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 14:36 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:69440 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:69470 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:70257 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-93569 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536962 | issue-trackingx_refsource_REDHAT |
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat AMQ Broker 7 |
cpe:/a:redhat:amq_broker:7
|
|
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 |
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|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 |
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|
|
| Red Hat | Red Hat build of Apicurio Registry 3 |
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|
|
| Red Hat | Red Hat build of Debezium 3 |
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|
|
| Red Hat | Red Hat Build of Keycloak |
cpe:/a:redhat:build_keycloak:
|
|
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
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| Red Hat | Red Hat Single Sign-On 7 |
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Date Public
2026-09-10 00:51
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CVE-2026-89044 (GCVE-0-2026-89044)
Vulnerability from cvelistv5 – Published: 2026-09-10 17:39 – Updated: 2026-09-18 17:23
VLAI
EPSS
VEX
Title
Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding
Summary
Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:11 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | vendor-advisory |
| https://github.com/netty/netty/commit/ca87393b0e9… | patch |
| https://github.com/netty/netty/commit/640d4d3324f… | patch |
| https://github.com/netty/netty/blob/netty-4.1.137… | technical-description |
| https://github.com/netty/netty/releases/tag/netty… | release-notes |
| https://github.com/netty/netty/releases/tag/netty… | release-notes |
| https://github.com/netty/netty | product |
| https://www.vulncheck.com/advisories/netty-4.1.13… | third-party-advisory |
Impacted products
Date Public
2026-07-20 00:00
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CVE-2026-88773 (GCVE-0-2026-88773)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:20 – Updated: 2026-09-29 15:21
VLAI
EPSS
VEX
Title
HTTP Request Smuggling
Summary
Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.
This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1-37.279 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:17 UTC
CWE
- CWE-444 - Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(Patch)
Affected: 0 , < 13.1-64.23 (Patch) Affected: 0 , < 14.1-73.37 FIPS (Patch) Affected: 0 , < 13.1-37.279 and NDcPP (Patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37 FIPS
(Patch)
Affected: 0 , < 13.1-64.23 (Patch) |
Date Public
2026-09-27 15:30
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Mitigation
Implementation
Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
Mitigation
Implementation
Use only SSL communication.
Mitigation
Implementation
Terminate the client session after each request.
Mitigation
System Configuration
Turn all pages to non-cacheable.
CAPEC-273: HTTP Response Smuggling
An adversary manipulates and injects malicious content in the form of secret unauthorized HTTP responses, into a single HTTP response from a vulnerable or compromised back-end HTTP agent (e.g., server).
See CanPrecede relationships for possible consequences.
CAPEC-33: HTTP Request Smuggling
An adversary abuses the flexibility and discrepancies in the parsing and interpretation of HTTP Request messages using various HTTP headers, request-line and body parameters as well as message sizes (denoted by the end of message signaled by a given HTTP header) by different intermediary HTTP agents (e.g., load balancer, reverse proxy, web caching proxies, application firewalls, etc.) to secretly send unauthorized and malicious HTTP requests to a back-end HTTP agent (e.g., web server).
See CanPrecede relationships for possible consequences.